/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package rpc

import (
	"sync"
)

var (
	seqnoMu  sync.Mutex
	seqnoMap = map[uint32]chan interface{}{}
)

func waitSeqno(seqno uint32) chan interface{} {
	seqnoMu.Lock()
	defer seqnoMu.Unlock()

	ch, ok := seqnoMap[seqno]
	if ok {
		return ch
	}

	ch = make(chan interface{}, 1)
	seqnoMap[seqno] = ch
	return ch
}

func stopSeqno(seqno uint32, op interface{}) {
	seqnoMu.Lock()
	defer seqnoMu.Unlock()

	ch, ok := seqnoMap[seqno]
	if !ok {
		return
	}
	ch <- op
	delete(seqnoMap, seqno)
}
